Peter Gutenberg, 41, left, of San Diego, and Brent Augustine, 28, of Ferndale, emerge from Lake Huron, Monday, Sept. 7, 2015, after a 5.7-mile swim from Michigan's Upper Peninsula. The inaugural Mighty Mac Swim had 84 open water swimmers traverse the Straits of Mackinac during the annual Labor Day Mackinac Bridge Walk, and fundraiser for Habitat for Humanity.
{}